exam Maths Puzzle Numerical Ability

Does anyone know this?

Is 31 a composit number

(A) true
( B) False

Thanks,
Ashley

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exam Other Question

Give the recursive formula for the series 4,16,64... Find the measures of two complementary angles, <a and <b< if m<a+(7X=4)DEG AND M,B(4X=9)DEG
SHOW WORK
M,A=___; M,b=___